You get the crackling crystals from the stormcaller wolf alpha, which only has an 8% chance of spawning in thunderhowl plateau. It's supposed to be a difficult fight, so I'd recommend you max everything out and buy minor metal combat art to fight it.
oh yeah, I don't think anyone has realized it yet since it won't happen unless you're trying for it, but actually there is already reincarnation. when you reach the end of your lifespan you restart the game and get additional fate points based on your cultivation realm. events will be coming soon along with a lot more content, I'll be working on it all night probably lol.